Contents
- Weather in September
- Frequently asked questions
- Average temperature in September
- Average pressure in September
- Average wind speed in September
- Average humidity in September
- Average rainfall in September
- Average rainfall days in September
- Average snowfall in September
- Average snowfall days in September
- Average daylight in September
- Average sunshine in September
- Average sunshine days in September
- Average UV index in September
- Average cloud cover in September
- Average visibility in September
Weather in September
Temperature
In Riverside, entering September brings a subtle temperature decrement, reducing from August's moderately hot 76.1°F (24.5°C) to an agreeable 70.7°F (21.5°C). During the nights in September, Riverside observes an average low-temperature of 58.6°F (14.8°C).Humidity
In September, the average relative humidity is 77%.Rainfall
In Riverside, in September, it is raining for 14.5 days, with typically 2.09" (53mm) of accumulated precipitation. In Riverside, during the entire year, the rain falls for 151.6 days and collects up to 24.37" (619mm) of precipitation.Snowfall
May through September are months without snowfall.Daylight
The average length of the day in September in Riverside is 12h and 28min.On the first day of September, sunrise is at 7:11 am and sunset at 8:18 pm. On the last day of the month, sunrise is at 7:42 am and sunset at 7:28 pm EDT.
Sunshine
In September, the average sunshine is 8.4h.UV index
In Riverside, the average daily maximum UV index in September is 4. A UV Index reading of 3 to 5 represents a medium health hazard from unsafe exposure to UV radiation for the ordinary person.Note: In September, the average maximum UV index of 4 translates into the following recommendations:
Be cautious. Those with fair skin can be subjected to burns in fewer than 30 minutes. Direct exposure to the Sun's intense radiation around midday should be avoided for health reasons. Your best bet for sun defense on the face, eyes, and neck is a hat with a wide brim.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are September temperatures in Riverside?
What is the average humidity in September?
How much does it rain in September?
When it does not snow?
Does it snow in September?
How many hours of daylight does Riverside have in September?
When are sunrise and sunset in September?
How many hours of sunshine does Riverside have in September?
How high is the UV index in September?
Average temperature in September
Riverside, MI
- Average high temperature in September: 70.7°F
The warmest months (with the highest average high temperature) are July and August (76.1°F).
The month with the lowest average high temperature is January (29.7°F).
- Average low temperature in September: 58.6°F
The month with the highest average low temperature is July (64.9°F).
The coldest month (with the lowest average low temperature) is January (22.1°F).
Average pressure in September
Riverside, MI
- Average pressure in September: 30.03"Hg
The months with the highest atmospheric pressure are January, March and November (30.09"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed in September
Riverside, MI
- Average wind speed in September: 9.5mph
The windiest month (with the highest average wind speed) is January (13.2mph).
The calmest month (with the lowest average wind speed) is July (7.8mph).
Average humidity in September
Riverside, MI
- Average humidity in September: 77%
The month with the highest relative humidity is January (84%).
The month with the lowest relative humidity is October (75%).
Average rainfall in September
Riverside, MI
- Average rainfall in September: 2.09"
The wettest month (with the highest rainfall) is June (3.15").
The driest month (with the least rainfall) is February (1.14").
Average rainfall days in September
Riverside, MI
- Average rainfall days in September: 14.5 days
The month with the highest number of rainy days is May (16.9 days).
The month with the least rainy days is February (5.1 days).
Average snowfall in September
Riverside, MI
- Average snowfall in September: 0"
The month with the highest snowfall is January (3.11").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in September
Riverside, MI
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (16.3 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Riverside, MI
- Average daylight in September: 12h and 3min
The month with the longest days is June (Average daylight: 15h and 12min).
The month with the shortest days is December (Average daylight: 9h and 12min).
- Average sunshine in September: 8h and 2min
The month with the most sunshine is July (Average sunshine: 10h and 42min).
The month with the least sunshine is January (Average sunshine: 2h and 42min).
Average sunshine days in September
Riverside, MI
- Average sunshine days in September: 13.3 days
The month with the most sunshine days is March (14.5 days).
The month with the least sunshine days is January (7.9 days).
Average UV index in September
Riverside, MI
- Average UV index in September: 4
The months with the highest UV index are June, July and August (UV index 6).
The month with the lowest UV index is December (UV index 1).
Average cloud cover in September
Riverside, MI
- Average cloud cover in September: 29
The month with the most cloud cover is January (Cloud cover 74).
The months with the least cloud cover are July and August (Cloud cover 26).
Average visibility in September
Riverside, MI
- Average visibility in September: 6mi
The months with the highest visibility are February, March, April, May, June, July, August, September, October, November and December (6mi).
The month with the lowest visibility is January (5mi).
Riverside, Michigan, USA
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